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Please check the font definition on documentation
https://ej2.syncfusion.com/aspnetcore/CircularGauge/ArcGauge#/material
It must be changed to:
var font = new Syncfusion.EJ2.CircularGauge.CircularGaugeFont() { FontFamily = "Roboto", Size = "0px", FontWeight = "Regular" };
thanks and regards
Stefan